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PIkaGirl
@PIkaGirl
October 2021
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1) tgα= 1/3, найти sin(2α-7π/4)
2) sinα = -3/5, π<a<3π/2, cosβ = 15/17, 3π/2<β<2, найти sin2α , cos2β , sin(α+β), cos(α-β).
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